Germany B123-131 2 Pages Question

These two pages were in back of germany collection seem to be of scott B123-131 issued Nov 18, 1938 if I am correct reading scott cat.

Wondering a few things, these are not first day cover issue type postmarks. Thus are these philatelic in nature made? handmade for some reason?

Also the cancellation on one is 3/12/1938 before stamps were issued. Is this a backdate for some event?

Thank you for your help and guidance with these pages. I dont speak german so do not know the importance or the event if any,

Richard

3-12-38 stands for 3 December 1938. Not backdated. And yes, of course this is philatelic! It was to commemorate the "Day of National Solidarity", or in other words: "Everybody behind Hitler"!

Peter

Thank you peter

The second issue is from the 1939 Stamp Day. Issued in January 8th, 1939.
In most places of continental Europe we write the date as day/month/year. For me, today's 28/09/2014.