Wonderfully detailed catalogue cover-page (?), or letterhead perhaps, for Charles Boswell included with an article on that maker in Dig's Vintage Gun Journal of 2nd August 2022. It could form the basis for a marvelous trade label!

View the article here.

If I were to case the delightful 16-bore fully engraved damascus BLE awaiting restoration in my gunsafe, such a label would be a very nice touch indeed!

Looks like Diggory has included a series on Gun Case Labels in the Journal. Certainly worth perusing...