question from:

Hi, I am attaching a picture of the bottom of a smaller Prismatique bowl numbered 791. The reason I am sending this to you is that there are unusual hand engraved numbers/letters along with the normal raised RW maker’s mark. I’m wondering if this is a glaze formula or something else. It is on two lines
top line – L i l (or L i 1)
2nd line – 76 (or T6) very sure it is 76
As I can only upload 1 pic, I will obviously send the one of the bottom but I do have other pics to send if you want to see them.
I’m just wondering if you could give me any information on the hand engraved "formula", does that make this more unique? etc… also, of course I would love to find out some guess as to what it may be worth.
Thanks so much for any information you can give me.
Nancy Parker