I have several 44 Magnums engraved and inlaid by Alvin White. He normally inlaid a small gold or silver block in the grip frame with A A White Engvr debossed on it. I am confident the 44 was not engraved and inlaid by Mr. White. I am not sure how Angelo Bee signed his work.
As to the engraver, my guess would be Shiro Ogawa /REI Engraving. It looks to be a very nice gun.
Thank you for your input and helping me out !