Military interlocking belt buckles

[The history detective]

Good afternoon
I am an antique dealer in military items, I search all over the UK for military artifacts. Recently 3 styles of interlocking belt buckles came into my possession. I have tried the internet but no luck so far so they are

1. Brass belt buckle Royal Arms motto: DIEU ET MON DROIT around the outer, the centre has Lion astride crown, Style of crown isn't Kings or Queens.

2. Brass belt buckle circle design around the outer, the centre has a Lion astride a kings crown.

3. Brass belt buckle motto Nil desparandum Victoria Centre is a crown. I saw a thread here that indicates that it may be an Australian buckle. Can this be confirmed.

Hoping in advance Mike