The checkering appears to be a grade 3/4 Ithaca pattern to me. I admit that I have not seen a Crass graded gun but am imagining what it would be if it were a Flues.
The engraving appears to be done in a style that would be called Bright Cut if it were on silver of the late 19th and early 20th century. I like the elegance of it. Reminds me of those wonderfully plain "funeral guns".
This appears , to me, to be a special order gun and of some way more than ordinary quality.
I would note that the striker bushings are not a match nor are the hammers.
It would be very interesting to learn for whom it was built.
Best,
John
