I recently bought this Dielve 1-RP5 3 part glass power insulator from "Open-Wire" . Light sky blue glass, three shells, the two upper shells have extra inner skirts. Vintage appears to be 1989 (embossed "89" on edge of upper part). I took the liberty of using his supplied photos (as they wouldn't look as good sitting in an inch and a half of NC snow). This is a big heavy "beast" of an insulator. This insulator appears to be the same as these ones seen in Galway Ireland: [id=147448536]

The smaller, 2 part, 30KV Dielve RP3 can be seen here: [id=10823836]

The RP3's earlier (Borma) predecessor can be seen here: [id=186396101]

The RP3 is designated as CD 383, I am not sure of the 1-RP5's CD number.