[Ron Ramirez]

Philco began using chevron or V cloth at the beginning of the 1935 season (June 1934) in such sets as the 16B, 16X, 200X and 500/501X. This pattern continued to be used in various Philco models through the 1937 season, after which it was discontinued.

The only real variations I've seen in this pattern are in 16B tombstone sets, where the chevron patterns seem a bit narrower. But there is a caveat, which I'll get to in a moment.

At the beginning of the 1938 season, Philco switched to an entirely different type of chevron pattern, such as the cloth you put in your 16B tombstone. Examples include the 38-1, 38-3, 38-4, 38-116. This pattern carried over into the 1939 season where it was used in some console models. This pattern was discontinued after the 1939 season.

Now the caveat: There is a variant of the V cloth used in certain 1935 models, including the 18H, 118D and 118H:

https://philcoradio.com/gallery2/1935a/#Model_118D

These models used a modified V that repeats itself horizontally, unlike the other chevron or V patterns.