Looking for approximation of age on this Len Castle wall hanging

A treasured piece I inherited from my parents. I believe Ron Sang may have bought for them, not positive but he gave them many pieces over the years.

Hi there Mike,

If you could post a photo of the mark on this lovely piece I may be able to help.
Len made exquisite cut clay pieces over several years, but his mark changed over time.

Here you go

Thanks, Len used this stamp from 1950 to 1994, so that is a wide timeframe.

I do recall lots of wire cut pieces at his Retrospective exhibition Making the Molecules Dance in 1994, but they were from all different times.

You are very fortunate to have such a piece of his work and sorry I can't be more precise.

No problem Hopefully someone else on here may recognise.

I went through the Making the Molecules Dance Catalogue and even though there are not many pictures, the descriptions fit for your wall hanging from the 1980's and 1990's.