[Below: This is called an 'indicia', which means someone has taken a prepaid postcard and cut out the stamp and used it for postage on an envelope. In this case two cutouts were used. You see this happening very rarely, when you do it is usually from stamp dealers or collectors, but this is business to business. It says:
'Ludwig Klein - Sport-, Reiseartikel-, Rucksack-, Taschen- und Gamaschen-Erzeugung'
(Ludwig Klein - Manufacturer of Sporting Goods, Travel Accessories, Backpacks, Bags, and Gaiters).]

[Below: Close-up. This was postmarked on March 11, 1943.]

[Below: This postage stamp comes from a very cool set of nine with themes inspired by the works of Richard Wagner. This particular stamp is Parsifal. The set of stamps were released on November 1, 1933. Finding this stamp used on the envelope makes it worth hundreds of dollars.]

[Below: Close-up. This was postmarked on March 6, 1934. This stamp shows Parsifal with the Grail.]

[Below: Reverse showing receival stamp. This was recieved the same day it was sent.]

[Below: This is interesting for a few reasons. First you'll notice it has no postage. It was machine canceled (the long strip of cancel covering the entire envelope) on April 12, 1935. Unfortunately we cannot make out the round seal stamped on the lower left hand corner. It was sent from 'Hindenburg-Hochschule (Hochschule für Wirtschafts- und Sozialwissenschaften)' (Hindenburg University (University of Economics and Social Sciences)). The post office has stamped two different stamps on it -- 'Portopflichtige Dienstsache' and 'Nachgebühr', the first one means 'Official Mail Subject to Postage' and the second meaning 'Postage Due'. Since this is official mail we know it was a government run school, which also means the government tried to cheat the post office on postage and got busted. Someone went to a death camp for this! But I'm not sure who it was that got sent to a death camp for this, the government who got caught cheating, or the post office who caught them. Hehe.]

[Below: Close-up of the horrid seal stamp.]

[Below: This was sent registered on July 30, 1935 to 'Nordstern - Versicherungs' (Nordstern Insurance) from 'Paul Meinelt - Stickereifabrikation' (Paul Meinelt - Embroidery Manufacturing). This insurance company was bought out in 1997 by another company, but the embroidery company is completely lost to time.]

[Below: This was received on July 31, 1935, the day after it was sent.]

[Below: This 1939 envelope (and contents) is from 'Missionaries of the Precious Blood', obviously a vampire organization.]

[Below: Interesting graphic. This is sent to a woman who invited missionaries to the 'Gregorian Gymnasium' and thanking her for sending them 90 RM.]

[Below: Close-up.]

[Below: Insert - front/reverse. This talks about their organization and their worship of blood. It even states that the dead can join, I kid you not. Free of charge, for 1 RM!]