These are the RALKEM or "RALK" 9927. They are still made today under the newer brand name Alfa-Proj and have the same model number. I am unaware of how old these handcuffs are but they had some rust on them that I had to contend with before they were properly functional. They were really so stiff I thought the double strand might have been pinched, ASP-style. But turns out it was just gunk and rust.
These are fantastic and very secure handcuffs. They use an abnormal flat key that has a split bit on it. The locking mechanism has 3 aspects that make this a particularly secure cuff in my opinion...
Security Point 1: The locking mechanism has 2 separated pawls. This inherently makes picking them much harder and at least more time consuming.
Security Point 2: The keyway has a spinning one-way ward which must be aligned correctly and the key inserted correctly. If someone is handcuffed behind their back (or in the dark) the chances of unlocking the handcuffs even if they had a key would be very low, unless they had practised meticulously.
Security Point 3: In order to unlock the handcuffs single lock, while turning the key it tightens the handcuffs by 1 click before releasing. This means if someone is wearing the handcuffs and is struggling around, trying to pick them, they will have to fight the level of force they are putting on the bow (single strand) of the cuffs. Their own wrist position is actively working against their ability to pick the cuffs with flimsy tools and making it more difficult to use a key.
The hinge is very sturdy indeed, but has a degree of movement that can help with the comfort of the wearer, rather than them be too inflexible. This hinge also adds to the over all security by making it more difficult to manipulate the lock, since you have less ability to adjust your arms position for optimal picking.
A key thing to remember about all RALKEM / Alfa-Proj handcuffs like this is never apply them overly tight, because to unlock them, it needs to get tighter by one click!
They also feature the typical security feature you tend to find in most modern handcuffs of what I call "the peg and groove" system, whereby the body of the cuff has protrusions that mate with grooves in the bow, so that when the cuff is locked closed, if a very strong person were to pull outwards, those protrusions would grip the bow to add more strength to keep the bow in place and locked in with the pawls. There are few exceptions in the world that lack this feature and usually it's because they are constructed so stoutly that an incredibly strong person would not be able to deform the bow in those cases. Obviously most toy and "up-market professional-like" toys like Viper, Kombat, Vipertek lack this feature.
These handcuffs are my first full set of handcuffs of this kind. I have the briefcase handcuff from this company (the newer branding Alfa-Proj) and you can check my channel to see a video if you wish. These are very smooth in operation, after having cleaned them up to remove rust and lubricate them. All Alfa-Proj / Ralkem seem to be very very smooth in operation. And they easily lock closed with the lightest press on the wrist.
Some info from Google Gemini AI:
"RALKEM 9927 handcuffs marked for both the Prague Police (P.P.) and the Slovak Ministry of Interior (MVS), dating from the post-1993 era.
The Context: P.P. stands for "Policie Praha," which is Czech for the Prague Police. This marks the cuffs as property of the police force in the Czech capital. MVS stands for "Ministerstvo vnitra Slovenské republiky," which is the Czech name for the Ministry of Interior of the Slovak Republic. This indicates the cuffs were part of an order for a Slovak government agency.
Dating: The use of these specific national and city-level police markings places the handcuffs' manufacturing after the January 1, 1993, "Velvet Divorce," when Czechoslovakia split into two separate countries. The presence of both markings on one item makes it a unique piece of police equipment from that historical period."
These are pretty comfortable and very secure handcuffs from the Czech Republic.
Enjoy
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