Item Title:
Watermark detector. H&A Wallace 'The Philatector' electric watermark detector boxed with instructions and filters in a card case. I. The Philatector watermark detector: light box in white plastic casing, with a push button and coloured filter swivel on the top, under an inscription reading 'THE PHILATECTOR'. Base of unit has inscriptions in field, reading 'MADE IN ENGLAND H. & A. WALLACE. (PHILATELISTS) LTD.. 94 OLD BROAD ST.. LONDON E.C.2. REGD. TRADE MARK NO. 603312 PATENT NO. 522018'. Top of