Brd Difference Between "Buchdruck" And "Indirekter Hochdruck

I got thousands and thousands of used coil singles left buy my dad. After more then 10 years, still trying to organize.

Almost complete with the 1977 to 1982 Buildings and Castles singles. Got complete sets of all different back numbers on some values, but one thing is bugging me. Michels list two varities on 6 of the values. "Buchdruck" and "Indirekter Hochdruck (letterset) Anyone know how to tell them apart?? My michel coil catalog is from 1991 and only has a written description (in german.) I looked at a new Michel at a stamp show and it had closeup pics of the 300 numerals on the 300 value, but both pictures looked the same to me.

Thanks

David

Here's the visual comparison you mentioned seeing in Michel.



The text translates as:

Bdr. [typography] -- Squashed edges, slightly uneven, cloudy color application
Ldr. [indirect lithography (letterset)] -- Smooth, uniform paint application without squashed edges

I'd guess yours is typography. The edges appear slightly squashed, and the numbers don't look crisp. Also note the unevenness of the number thickness, especially the left versus right sides of the last "0".

Thanks both of you for the help.
And I still can't tell the difference. But based on the noted links, I am not the only one.

The pics not mine, just a .jpg I grabbed to show what series I was speaking of. My father left me LOTS of used coil singles with numbers I am still trying to figure out. Don't have an exact count, but he used to buy 10 kilo lots of high value commons through the 1980s to get them. I sold off one lot of the Science and Industry high value (>1 DM) with an estimated 17,000 stamps. I've been letting the used coils sit for >10 years while I worked through everything else. But its finally time to figure out.

Your response have been helpful as now I can determine, based on when the letterset printings started, that they weren't issued until about the time he stopped buying lots, so mine must be the earlier ones. Good thing, too. Can't tell on a single mint, not going to be easy on 1000s of used.

David