Hate to drudge up an old thread, but trying to date the Shogun Selectra that I'm working on. Serial number doesn't seem to match many of the formats you other guys have.

SN: BS725514

Tangaloy CroMo frame Made in Japan
Sugino crankset
Shimano Light Action RD
Shimano SLR Brake Calipers
Shimano SLR Brake Levers
Shimano SIS DT shifters SL-S434
Shimano FD-Z204 front der