I've picked up quite a few postcards, but they don't play well with typewriters IMHO.
Their paper is too thick, making it hard to have them bend and rotate on the platen. When you type, it also just feels bad, like typing on a hardened platen; too harsh and jarring.
I still try, but now just use them if I know the postcard has a special connection to the person I'm sending it too, I don't want to send a full letter, or just use them for sketching/random art

Paradoxis wrote:

Oh my god, that math Olympia went for A DOLLAR AND SEVENTEEN CENTS AMERICAN?!!  Whoever got that is one lucky person.....
I know that my Coronet Super 12 has two type bars where the type can be switched out, and I think I have somewhere a little leaflet advertisement that showed all the different sorts of type sets that could be bought with four (maybe five?) interchangeables in each.  One for medical writing, one for mathematics, and one for engineering, I think.  There might be more sets, but I'm not certain.  I'll try looking for the thing and if I find it I'll post a picture

 
I've got all the sets. I picked up a couple keys from Craigslist a few years ago; then tracked down someone selling the sets on eBay. Think I got em for$16.

I've been wanting an apothecary machine for awhile (I'm a nurse), so the interchangeable keys were a cheap way to get one.

I ask have a Royal P Woodgrain with the mathematical keyboard.
Got it for$40 off shopgoodwill. They had horrible pictures of it, couldn't even tell it was a Royal, let alone a Woodgrain. I suspected it might be, so risked bidding.

Imagine my surprise when it was a Woodgrain in beautiful shape with the full math keys (pi, square root, etc)!

Just picked up a Corona 3 Folding. It has the bilateral FIG/CAPS keys, so probably from the later 1920's. The machine has no rust.  Keys on the left side are really sluggish/sticking, snappy on the right. Rubber feet have flattened and deformed into ugly little puddles and the platen is rock hard. 

The case is in good shape (not great). The clasp/lock is barely functional, I think some polishing with oil added to the mechanism should help out.

Should clean up beautifully. I usually do my own cleaning/maintenance on the basics... but I've been wanting a folding machine for years. I think I'll take it to Ace Typewriter here in Portland for a truly professional overhaul.

kind of a trick question, kind of not.  I know there's aesthetic differences between years. I wasn't sure if the quality or features changed over time.

I was thinking along the lines of the Smith Corona Silents... same typerwriter, but different machines over time.

Okay, so of the two Hermes ultraportables, which one do you prefer?