I'm not familiar with the Supermatic shutter, but what binds up most unserviced leaf shutters is the self-timer, which is what I suspect you've activated. Try tripping the shutter and applying very gentle pressure in the opposite direction to the way you pushed it when it locked - it might cause it to run out. If not, you'll have to get inside and service it.
Try fiddling with the flash sync setting X or M while you try to free it. I briefly had a Kodak retinette, not same shutter, but I recall the self timer and sync influenced each other. you were not supposed to set the self timer except in X sync.
Where can i find flash sync on the camera ...
That shutter might not be X synchronized ...
A Kodamatic does not have flash sync. A Flash Kodamatic has F and M flash bulb sync. A Kodamatic X has electronic flash sync only.
A Supermatic does not have flash sync. A Flash Supermatic has F and M flash bulb sync. A Supermatic X has electronic flash sync.
There is no flash sync for your shutter.
The Supermatic series of shutters do not have a self timer, they do have a Press to Focus that presses in toward the lens once the shutter is cocked. Cock the shutter-press and hold the Press to Focus ball-trip the shutter and it locks wide open-recock to release the Press to Focus.
Sounds like your shutter needs a CLA.
A CLA will run $75 to $150 + shipping.
Try exercising it 50 to 100 cycles at various speeds, it might improve. It will be a moderately difficult shutter to learn on.
The links in post #4 show the disassembly. Its near identical to a Supermatic inside.
It will last 15 to 20 years if serviced before it needs servicing again.
Open the camera back. With the bellows near fully retracted unscrew the retainer ring from the rear of the shutter, you may need to unscrew the rear lens cell first if it extends over the ring, likely it won't.
Remove the shutter from the front standard noting its orientation and any shims between the shutter and front standard.
Remove the lens cells, front and rear.
Put it in a sealable container and cover with Naphtha and allow to sit for a few hours. You can also use 90% Isopropyl Alcohol or aerosol contact cleaner.
Naphtha and Alcohol may damage the finish.
Drain and let dry.
Try the various speeds.
It will last a few months to a year or two if it comes back to working with this method.
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