[MrFixr55]

First off, Jacque, Welcome to the Philco Phorum, a Phamily Phriendly Phorum of Philco Phans Pfull of Phun Pfacts.  (See a pattern here?)

Unfortunately, I have no idea of value for this radio.  It is my belief that the market for antique radios may be depressed due to several reasons, the largest being the age of the average collector and either the downsizing of their collections as they move into smaller "adult" communities or estate sales due to the passing away of the collector. 

If using marketplaces such as eBay as a guide, be sure to look not at the offered "Buy it now" price, as these can be somewhere between unrealistic and downright ridiculous.  However, actual sale prices can be misleading due to how many similar radios are currently on the market, etc.

Having said that, in my humble opinion, you have a real piece of history.  I have always been interested in farm radios.  You have the farm version of an iconic radio in one of the most iconic and beautiful cabinets that Philco (and other manufacturers) ever made.  This is the farm version of the Philco Model 70, one of Philco's first Superheterodyne radios (licenses had to be purchased from RCA).  The farm version has very similar construction and circuitry, except for the fact that there is no power transformer or rectifier and an additional stage of AF amplification.  Since permanent magnets were bulky, expensive and not so per anent until the invention of AlNiCo V magnets, "electrodynamic" speakers (speakers with a field coil as a magnet) were popular in AC sets while farm sets used a permanent magnet speaker.  Note the massive magnet on your speaker.  This is possibly the reason for the crack in the front panel of your cabinet.  Nonetheless, except for somewhat weaker audio output (0.8W for the 35 vs about 2W for the 70), this farm set (35) has all the sensitivity of its AC equivalent (70).  This set ran on a 2V storage battery for the filaments which had to be recharged, by a service station and three 45V "B" batteries which had to be replaced after about 100 hours if use.  A 22.5V C battery would last more than a year as very little current was drawn for grid bias from this battery.  Considering the remote location and expense of the batteries, the farm radio was likely used sparingly, usually for crop reports, Sunday religious programs the occasional Saturday night entertainment and news of the growing troubles in Europe and Asia which culminated in WWII.

If you want to restore and use this radio, here are the following issues:

• Replacing missing tubes and components.  The tube types used in this set are not the most common types, but should be available on the various auction websites.
  

• Recapping.  This should be no more difficult than recapping a line powered radio, and possibly easier.
  

• RF, oscillator and IF coils.  The primaries of these coils have been known to fail, requiring rewinding of these primaries.  This is not impossible and instructions are in our library.
  

• Power.  This may be the most difficult issue.  Since this set runs on batteries which are no longer available, an external power supply such as an ARBE III (about $170.00) or a home built power supply is needed to operate this radio.  Coming up with 135V worth of 9V or AA batteries and 3V worth of D cells is possible, but not exactly cheap.  Building a 135V DC supply is not too difficult, but building a stable 2V DC supply for the filaments is not easy.  3V "wall warts" are commonly available but the voltage has to be dropped to 2V.  This can be done by external resistors by adding up all the filament current drawn by these tubes, then calculating the resistance needed using Ohm's Law.
  

I am a lifelong (70 year) resident of the Huntington Town area of Long Island, NY.  Long Island had a rich history of vegetable farms (especially potatoes), dairy farms and duck farms.  However, due to post WWII suburban sprawl, parasites that destroyed potato farming and other environmental concerns, farming is no longer the industry that it was.  However, one unique thing about farming on Long Island is that due to its proximity to New York City, Connecticut, sea lanes, etc., mechanization, transportation, electricity, telephone and water and other infrastructure were readily available.  No sod houses or log cabins here.  Therefore, farm sets were not popular here.  However, many other rural areas of the country did not have power until rural electrification projects like the Tennessee Valley Authority and other rural electrification projects in the 1930s through 1950s in the US brought reliable utility power to farms.

In the beginning of radio, all radios were battery powered until between 1925 and 1928 where power supplies and tubes whose heaters could be run on AC were developed.  However, several schemes of battery power were used on farm radios depending on the area of the country, whether 6V or 30V lighting generators or windmills were popular in the area, whether the farm owned cars trucks or tractors that used 6V batteries in their electrical systems, how near in the future electrification was coming to the area, etc.  Based on the fact that the house where the radio was found was built of sod, I would have to assume that the area was "off the grid" for a long time.

Hope this helps.  Keep on posting, and again, welcome to the Phorum!