Did the O.K. Cutter(t-41) replace the Bird Cutter(t-42)? They both have the similar phrase "Cutter OK Whiskey" or "A.P. Hotaling's O.K. Cutter Whiskey" on the reverse in different patterns.
The A No 1 Cutter(t-40) is the oddball. Sure seems redundant, with all the Circle Cutters that say A No. 1 on the reverse.
Here are some picts. to check out and compare these 3 bottles.
A no 1(t-40) and Bird(t-42) from my collection.
O.K. Cutter(t-41) Aaron Hill collection.

Here is the O.K Cutter(t-41) from Auction #47 - American Bottle Auctions. A nice example with very strong embossing. Notice how heavy the "slug"area is around the crown. I have seen some that the "slug" area is even more defined.

O.K. Cutter(t-41) Aaron Hill collection.

Here is the O.K Cutter(t-41) from Auction #47 - American Bottle Auctions. A nice example with very strong embossing. Notice how heavy the "slug"area is around the crown. I have seen some that the "slug" area is even more defined.
Check out the "slug area" on this one, not nearly as pronounced. This particular O.K. has the look of the A No 1's . Did the O.K. and the A no 1 come on the scene at the same time, with the A no 1 being dropped quickly. Redundant bottle. ??
Everything is the same as the O.K., except the lettering A No 1. They are two separate molds however, the lettering slightly different.
The A No 1 crown is "slugged on", but you have to look to look close to see it. I am not sure about these marks around the crowns. A No 1's lightly "slugged", O.K.'s "heavier slug", some very heavy.

Here is the ultimate O.K. submitted by 'A.P.Hotaling'. Certainly the best color I have ever seen in one. I have seen Bird Cutters in a similar coloration, but I have not seen the A No 1 in a color like this. They seem to be in a narrower band of lighter amber to yellowish amber.