Gold hallmark

[sixgun]

Any ideas on the hallmark at the bottom of this piece?
The 2000 is presumably the year 2000 but the Z year mark is 1999. This bears the Sheffield assay office rose and the crown for gold with a 375 purity. The IBB is International Bullion and Metal Brokers. So all of these are covered other than the almost triangular shape at the bottom of the piece.

 

[Roy]

Interesting one @sixgun!

To be honest, I don't know but let me share what I found.

The 2000 hallmark is a celebratory one, aptly named 'the Millennium hallmark' and could be used in 1999 and 2000, as shown in this pic:

Note date 'a'. (2000)

The outfit IBB is based in Hatton Garden so I don't know why it was assayed in Sheffield rather than London?

They also knocked these out in sterling silver:

Now, as to the bottom hallmark, I can only offer my ideas.

It looks like a 'handshake', I detect Masonic vibes 😇

The 3 triangles may represent Air, Fire and Water (common in symbology).

Perhaps a batch of custom pieces were created for a group, society, members club etc.?

Nice piece 👌 

[sixgun]

41 minutes ago, Roy said:

Now, as to the bottom hallmark, I can only offer my ideas.

It looks like a 'handshake', I detect Masonic vibes 😇

The 3 triangles may represent Air, Fire and Water (common in symbology).

Perhaps a batch of custom pieces were created for a group, society, members club etc.?

Indeed the Masonic angle came to my mind when looking at the triangular mark.
I thought i would wear this to show i was a member of the Illuminati.

[Skyfiller]

Would agree with masonic vibes and it actually all 4 triangles in it, air, water, fire and earth.

[Roy]

Good spot @Skyfiller 👍