Picked these up at a swap meet years ago.
Haven't a clue  what they are.
Anybody?

Bob Z.

Lower left looks like an Arden.
Lower center looks like a Testors.

"Tight Lines!"
Wes

               I think the middle bottom is a O&R plug for the Mite .049.  I also believe the short plugs up top starting with the 2nd in from the left is  OK short G-3. The plug next to it looks similar to the shorts used on the Baby Spitfire. They usually have Spitfire stamped on them but this one doesn't appear to have that.

MM - that Glo-Be has the strangest element I've ever seen!

Wes - I have a McCoy .049 that has a plug similar to the small one.

Reptoid - I think you're correct. The later OK plugs had silver stems instead of brass.

Ken - you may be correct - O&R Midget. I'll check out my Baby Spitfires - somewhere I have a bunch of them.

Brett - Actually, I've heard of that happening on the O&R 60 but not on the smaller engines.
Also, an old-time engine guru told me to NEVER run more than 10% nitro in and O&R because any more causes the cylinder to launch off the engine!
Yes, the Arden plug supposedly had a replaceable element. I've got some but I've never tried replacing one.

Thanks for all your help gents. Your knowledge is amazing!

Bob Z.

Also, an old-time engine guru told me to NEVER run more than 10% nitro in and O&R because any more causes the cylinder to launch off the engine!

  Confirmed! 

     The reason I was doing that was that it didn't show the slightest inclination to keep running without the battery no matter what plug I used on Fox Superfuel. I discovered that the first successful glow mixes were 3/8 Nitromethane, 1/8 ether, and 1/8 nitrobenzine, 3/8 castor(!), and the rest methanol. If that's what they thought it took in 1947, it was probably for use in engines like the converted ignition engines, so, that's what I used*. I had also heard that it was common to blow up these wimpy FF "chugger" ignition engines trying to run them on glow, and sure enough, that's exactly what happened. The other issue was that it was a 9-6 Top Flite, rather than the more typical FF ignition prop like a 12-8 at 4000 rpm.

   It was no great loss, it was my dad's engine, and he hated it because it would be running along fine, misfire ,and then 50/50 start back up backwards, which led to some entertaining stories, like when his Mr Mulligan backed over my Uncle Donnie.

     BTW, I ran a converted McCoy 29RR Red Head on the same fuel, no problem, and amazing (for the time...) power, and outstanding "shoe polish" smell that is probably still hanging in the garage.

     Brett

p.s. another interesting point was that it was absolutely no problem for a 14-year-old to get a pint of nitrobenzine in central Arkansas in 1975, go to the drugstore and the pharmacist would order it for you. He did balk at the 20 lbs of powdered Sulfur and 40 lbs of zinc powder, because he knew me.

*p.s. Technically it was Cox Racing fuel with "additives", but that did not affect the results!

Upper left looks like an old O.K. (Cub)

   That looks like a McCoy "standard short".

     Brett

Brett stated: "On the Arden, you  can hypothetically replace the element if it burns out!  Where you might get an Arden replacement element is left to the reader."
YES, you can indeed replace the element on the early Arden plugs the the practise only lasted a bit under a year, as it was tricky.
I have some elements (hot and cold) if anyone needs one.
First photo shows the original instruction sheet.
The spring ring "B" is welded to the element "A".
The threaded portion "F" screws into the brass nut "E"
Second photo shows the actual element assembly.

You can tell which plug has the replaceable element - it had the cross slot "D".

Interesting or what?

Bob Z.

             I wasn't aware that Arden was located in Danbury, CT. I frequently rode my motorcycle to Danbury on 2 nd Sunday of the month. Several thousand motorcyclists would meet at the Marcus Dairy. The dairy was a great place with plenty of room and a great place to catch a bite. Off to the side under a highway was a long stretch of road which many car and also bike drag races took place. I enjoyed watching that.

10 more odd plugs!

Upper photo, second from right: VECO RC (I think)

Lower photo, two on left - O&R?

YES!!!!!