The frame was lengthened, the check hook added, and the location of the cross bolt in the lock was changed at 24018 (first surviving) or a little before. The first few top actions did not have the doll's head, but room was soon found. The long , check hook lifter action opens at a touch, and is very convenient. I'll try to post a table of the s/n of check hook guns.
Best, Austin
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