This is an unusual pattern whose clustered shapes are three triangles made of etched lines in a manner similar to the pattern found on the Gurlande. Of course this is a BP so a matching FP is likely to exist.
I have seen a similar design on a Parker 61. The pattern was called Waterdrop but differed in that instead of a cluster of three triangles shown above, the 61 had only a single triangle.
Here is a picture of a solid 18K gold Parker 61, used with permission from of Sim Wurzberger of Topline Marketing in New York City. It was listed as an eBay auction at the end of November, 2000. If it doesn't meet reserve on eBay and you have interest in buying this, contact him directly by email.
