Good Morning, first time on here so please be nice ..Recently my young son and i were running our metal detector over an old house site when we dug up an interesting padlock. It has Union 6 Lever stamped on what looks like a zinc body, with a brass shackle. On one side of the shackle is written, Pat No. 508247, on the reverse side of the shackle is DS 23. It also has on the Zinc body MADE IN ENGLAND. I have cleaned it up and getting a key made for it at work. I can upload some photos when i get back to work tomorrow. I guess im just curious about its age etc. Ive seen one similar online but it has DS 18 stamped on the shackle.If it helps the old house site looks like it was an old New Zealand Railway house. Any help at all is appreciated,

Cheers

Daryl, Wellington, New Zealand