Physical description
Wooden Wax Sealing stamp - wood handle with a small brass stamp with the letters "R.Ty." and "I" or "1" underneath.
See e-mail message from Andrew Cook dated 3-2-2019, Andrew advised "That is a wax seal (see attached image of a modern day one). You can still buy them to this day. I'm only guessing, but maybe the seal came from one of Melbourne's cable tram depots? 'R' could possibly stand for 'Richmond' or maybe 'Revenue'.
See: https://milligram.com/creativity/wax-seals - accessed 22/2/2019 for samples of the seals and the stamps - very similar in design.