The first mount weighs: 12.93g and measures: 29x38mm. From what I found it's either a strap end or a mount for cavalry dating late 2nd century -throughout third.
As for the second weighs: 15.20g and measures: 30x39mm. Havn't been able to find a match, seems to have an
anchor design. I suspect this to be of the same age and aswell attributed to cavalry.
Thanks