BSA Breakdown Pattern Barrel Sealing Washer Leather.
Oversize - Requires Fitting.
OD: 12mm
ID: 7mm
Ths spare fits the following models amongst others:
Diana Model 25
Diana Model 27
Diana G34, G36, G44, G46
Diana series 70 Model 71, 77, 79
Milbro G34
Slavia 618
Slavia 620
Webley Falcon
Wagria