I see that Holts are selling off the unsold lots in their latest auction. There's an Army & Navy marked Improved Model D juvenile model on sale 'buy it now' for £520 including buyer's premium and VAT if anyone's interested? Probably another £25 for postage. (Nothing to do with me).

Description here:

BSA FOR ARMY & NAVY C.S. LTD
A RARE .177 UNDER-LEVER SPRING AIR-RIFLE, MODEL 'IMPROVED MODEL 'D' JUNIOR', serial no. 65692,
circa 1913, with 15 1/2in. barrel, dove-tailed fore-sight, dove-tailed rear-sight with one standing notch and a folding leaf numbered '10' and '20' respectively, the top of barrel signed 'ARMY & NAVY C.S.LD, LONDON', rotary loading tap with patent number stamp on retaining plate, plain air-chamber marked 'THE B.S.A. AIR RIFLE (IMPROVED MODEL D), THE BIRMINGHAM SMALL ARMS CO LTD ENGLAND, SOLE MANUFACTURERS', trigger block with patent number and serial number, 11 1/4in. straight-hand butt-stock (small loss at head), chequered at the wrist, ribbed end to butt (replacement stock-bolt cover), trigger adjustment screw to front of the cast trigger-guard bow, diminutive cocking link (possibly with old repair) and lever stamped with patents and fitted with a side latch, traces of finish throughout in sheltered areas.


http://auctions.holtsauctioneers.com...sults.asp?st=x