This is a close up of the overview shown in the [id=246015974; previous picture]. Can anyone identify these?

They have been identified as

Brown ones: Cordeaux PO. No. 3's. Double groove.

Just left of pole: Cordeaux PO. No. 1 or 5. Double groove.

Just right of pole: Cordeaux PO. No. 3. Double groove. Post 1946