yes I think you have one of their machine plates there Mark. As chubbbramah says it was the norm for machinery manufacturers to fit an impressive maker’s plate, in addition to separate, more basic ID plates stamped with specification, model and serial numbers etc.
That’s not to say Greig’s wouldn’t have been capable of making safes though- most of the low-end safes of that era only involved crude fabrication and very low-level engineering, far more basic than the precision engineering involved in their heavy machinery. Although the machines of the day typically used a lot of big castings for construction, many did use a lot of heavy plate and fabrication work for housing gearing and drives etc, so I’m sure they would have been more than capable of doing so.
I’ve never encountered or heard of one though, and like patent says there never seems to be any mention of safes, so I’d think it’s a pretty safe bet that they stuck with their range of machines and that your plate is off one of those. It’s a very nice plate though- might be worth considering a swap at some time if you ever wanted to let it go, perhaps for some brass climax key caps…🙁happy):
