This is Manufacturers Part #725-1BD-A1-1. Serial Number 679


Label reads:


Pioneer Central Div.
Bendix Aviation Corp.
Buaer U.S. Navy
Indicator Turn & Slip Air Driven
Rating 2 IN HG
Type MD-2
Stock No. RN6619-663-4116-VIYT
AND DRAWING NO. AND 10403
1725-1BD-A1-1 MFRS PART NO.
ORDER NO. N383 17-383 43214A
SERIAL NO. 679


Unknown working order.  Measures 2-1/4" round x 5" tall.