what was done in the GDR PMP means in ceramics?

Ive got a peace of pottery that I am trying to locate the marks by a crown below that is 1887 m pmp underthe date he has made ​​in the GDR handpainted

That means German Democratic Republic GDR.

Centigrade Kiln Fired Art Show 2009 ‘Medieval Knights’ Part 1

Polmedia Polish Pottery New Stoneware bowl Handpainted from Boleslawiec Poland $30.99

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Polmedia Polish Pottery New Stoneware plate Handpainted from Boleslawiec Poland $31.99

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