Richard:
The grasp material used on this reel is definitely ivory but the patina is so heavy that it does not shine brightly under UV when compared to other ivory grasps (even after cleaning it with dish soap solution). So I also used the hot needle test and it did not make any smell or mark which is the characteristic of ivory.
The screws are iron and their heads are fragile and falling apart so I decided to only soak in mineral spirits, wipe and put it on the shelf. My conclusion is that this is an ancient reel with an ivory grasp. There are no maker's marks. The clues as to maker would be the age, style, curved handle and the use of 4 iron rivets to hold the foot, but I don't know who it might be.
Pics of this grasp compared to other reels with ivory grasps under regular light and then black light:
The 4 reels in the pic [L-R]: (a) Meek & Milam, (b) Ustonson, (c) subject reel, (d)unmarked clamp winch- probably Haywood
(refer to "Reel Grasp material detection" in Vol XXV, No. 4 of the ORCA
Reel News, published July 2015.)