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Heres mine ;-) As far on how to use it, just read the instructions in the top of the box. They translate like this:

1: Remove the Lid from the device
2: Turn the drum in direction of the arrow to load the clockwork spring
3: Set the Time by turning the Zt button in direction of the arrow
4: Put the Lid back in place and screw on TIGHT!
5: Remove the safety cap and insert detonator
6: Screw the device on the explosives
7: Remove the "Blind" screw
8: Screw in the "Scharf" screw

ARMED

If the screw can´t be screwed in all the way the device is damaged!

9: Turn the starting-ring to "Geht"

If you follow these instructions you will observe and hear that the clockwork is running. Have fun playing with it! These things are just a beautyful piece of ordnance, so complex for just such a simple task!

**type91** · 04-06-2008, 01:45 PM

Not showing my ignorance, what would this lovely device be used for, shame such things were blown up

**François B.** · 04-06-2008, 01:49 PM

Just love them

Great pieces guys....

**Bill Grist** · 04-06-2008, 02:19 PM

Very nice J-Feder 504s.. You gota love the German enginering...BILL

**Alan Smith** · 04-09-2008, 05:26 PM

When I first began collecting at the age of about 12 years old (c. 1983) I frequented a local flea market looking for German military items.

For a year or so, a vendor had a J-Feder 504 w/ carrying case on his table for $20.00. Neither I nor my dad had any idea what it was, but we knew that it looked like some sort of German military item. I remember looking closely at it and the box on many occasions, trying to find some swastikas or other WWII German military markings. I could find none (though I'm sure it had some WaA's on it - at the tender age of 12 I did not know to look for such markings). Looking at the instructions and markings on the box shown in the photos in this thread you can see why I was confused - these things really don't have any obvious "military" looking markings, designations, stock numbers, etc. on them.

Anyway, $20.00 would have been everything I could come up with for my collecting budget at the time (and then some). Thus, I passed on the J-Feder 504 as I simply could not convince myself that it was "something WWII German" and worth digging deep to purchase. Eventually the J-Feder 504 was gone - presumably into the collection of some knowledgeable collector.

It was not until many years later (like the past 5 years or so) that I was surprised to learn the identity of this mystery item from my early collecting days.

**Von Hoth** · 04-15-2008, 08:21 PM

very, very cool item.

I just got into german time units so this is wonderful to me. I found one for sale but it is not as complete as these two. Very, Very nice!!!

**captainhoot** · 04-19-2008, 05:12 PM

Thanks guys.

Thanks Dogtagman, for the translation of those instructions.
I will have to play with it, now that I have those.

Alan: That's an interesting story...Pity you didn't realize what it was, but your'e right about the lack of markings...
Bill and Van Hoth: Thanks for the compliments. I real like these items-
especially when you can find them complete...
This forum is so helpful !!!

-Capthoot

**captainhoot** · 04-22-2008, 08:18 AM

It works !!!!

I have been "playing" with my J-feder, using the instruction from Dogtagman and other reference site on the internet, and it still works !!!
Now I want to blow something up !!! ( just kidding)

It's an interesting piece. It's nice to know it still works !! Like a Swiss
watch, it has a deliberate 'tic, tic...

Thanks again for the inputs.

-Capthoot

**dogtagman** · 04-23-2008, 12:52 PM

good to hear that it´s still working, just one tip, don´t put too much tension on the spring, it may get damaged during time when on high tension.

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J-Feder 504

J-Feder 504

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