Significance
Has a strong association with tram crews, possibly inspector (Dave Kellett?) in Ballarat, would have been issued to crews in order operate the tram car doors. Normally a L shaped key.
Physical description
T shaped steel piece, with a round top piece or handle with a rod that has been forged at the lower end to give a tapered square shape for use possibly in external doors on SECV Ballarat Trams - known as a square key. Was used to secure doors in both open and closed positions. Was probably chrome plated at the time of manufacture.
.1 - square key fashioned from rod and welded at the top.