Trying to I.D. Possible Carved Artist Hand Stamp

[purveyorium]

This wood hand stamp has a carved bottom with "R.B.S." below several glyphs. The top of the handle has a single glyph. I am not sure if its an artist stamp used to sign a work of art or some type of seal used for business purposes.

Bottom

rbs1.jpg (128.81 KiB) Viewed 3472 times

Top of Handle

rbs3.jpg (103.99 KiB) Viewed 3472 times

Thanks for Your Help!

[Ongakuka]

photo 1: I can't identify the kanji on the left and right, the middle one is probably 羅 (pronounced 'ra')

photo 2: 上 (pronounced 'ue')

Sorry not much help

[shin1ro]

I'm not sure but photo 1 might be:
洸羅濟


This form of these kanji is called 篆書 てんしょ.
The kanji order could be from right to left, if this stamp follows in the old format.

I guess it's Chinese person's name stamp with alphabet of each kanji pronunciation.
R. B. S is different from initials of Japanese pronunciation of these three. In Japanese Ko, Ra and Sai/Sei respectively.

-shin1ro