Gibson Early 1937 EH150
It is commonly known that the transition of the EH150 model goes from the 1935 aluminum version to the early prototypic E150 of 1936, to the non-ornamentation with screwed on back of mid-'36-mid-'37 to the mid-'37-1938 model with headstock ornamentation, triple bound top/bottom and screwed on back. After 1938 the model has a glued on back with the newer horseshoe pickup inside.
The example featured on this page is unique as it only has 1-ply of binding on the screwed on bottom. The rest of this piece is consistent with the mid-'36-mid-'37 model.
There is apparently a bit more to the history of the EH-150 on this page. According to Lynn Wheelwright, this EH, #1238-20 is from a batch that began shipping 4-13-37. This one was one of the last two from this batch and shipped 6-22-37. #1238-2(the very last EH-150 from this batch) shipped 6-22-37, as well and has no back binding.
Mr. Wheelwright goes on to explain that the next two batch's, batch 1239 with 25 units and batch 1319 with 50 units had no back binding. Batch 95 had 2 custom white Smeck sets with black top binding....one is 95-2. Most importantly, it is pointed out that batch 227 appears to be a trans batch where the bound backs start. There appears to only be triple and not single bound backs in this batch(like the photo above).
This EH 150, #1238-20 was sent back to Gibson for some sort of repair in mid-1938 (the red mark means a re-ship following a repair). According to Mr. Wheelwright, 'the repair may have been the back had split and Gibson replaced it as by then they were shipping the glue back models.' 'This might be the only EH-150 with a factory original single bound back, albeit most likely a replacement.'
Note the shipping ledgers above. (courtesy Lynn Wheelwright)