1 Pfennig 1950 D - Newly Discovered Bimetallic Pattern Coin?

Hello everyone,

I'm reaching out to this forum because I've come across a highly unusual 1 Pfennig coin from 1950 (mintmark D, Munich) that might represent an undocumented experimental or pattern strike with a bimetallic composition.

#128269; What has been observed so far:
The coin is a standard 1 Pfennig from the Federal Republic of Germany, dated 1950 and minted in Munich (D).

Along the rim, a distinct separation line between two metals is clearly visible. It does not resemble a copper cladding, but rather a true fusion of two different metal materials.

The copper-colored outer layer is unusually thick and shows a reddish, glossy shine - very different from typical copper-plated steel coins of the time, which usually show heavy discoloration.

Oxidation at the rim appears bluish to greenish, possibly indicating iron or zinc content in the core.

The coin's edge is unusually rounded and uniform, unlike the sharper, flatter rims of typical Pfennig coins from this era.

The coin is strongly magnetic, confirming a ferromagnetic metal core.

#128247; I've attached several photos showing the rim structure, oxidation, and die imprint.

#128218; Background:
To my knowledge, official German bimetallic test strikes only appeared starting in the 1980s (e.g., experimental 2 DM pieces).
A systematic bimetallic strike of Pfennig coins in 1950 is not documented in any known public or institutional sources.

#10067; My questions to the community:
Has anyone seen similar coins or verified examples of bimetallic structure (not just copper-plating) in 1 Pfennig coins from 1949-1950?

Are there any documents or references indicating that the Munich mint (D) may have produced experimental strikes like this?

If this coin indeed represents an undocumented bimetallic pattern piece:
#8195;- How would you assess its numismatic and historical significance?

I would be very grateful for any thoughts, references, comparisons, or expert assessments you may be able to share.

Warm regards,
Monique