Yes, JA stands for Joseph (not James) Asbury. My bad, I checked the spelling of the surname but forgot to check I had remembered the right first name.

The date stamp o 1 c on the proof marks is for 1988 and must refer to the later 3” proof test as the o impinges on the / of the 7/8 oz. from the earlier 2 1/2 inch marks. There seems to be an earlier date stamp but I cannot read the detail.

John Ormiston is an interesting character. He was a Director of Holland and Holland, and the chap who bought the case for Denys Finch-Hatton’s double rifle and later found the rifle to go with it.

For more information on him go the Vintage Gun Journal, search Ormiston and you will find a number of articles by or about him.