It seems the Tanita twin stick white proto is just a relabeled gen1 SEGA Boardmaster supergun shell from the original company who made it : the Tanita prototype twin stick had the same white powder coat , but now it’s revised in matte black, the twin stick proto also had the exact same structure and even the same function button holes (two toggle switches and one 24mm central button) as the 1st version of the SEGA Boardmaster… plus all their promo pics NEVER showed the left side where the supergun connector slot was located…how convenient. Shown on the bottom is the proto. The final black version VDC-18-C doesn’t have the top function holes like gen1 boardmaster anymore .
Supposedly a new joystick was to be designed for Tanita and this is it now in the final black case : 
Seems like it’s in the same vein as some of the console VO sticks apart from that collar which seems to house the pivot bearing, with a typical sanwa JLK type handle
the demonstration proto for the black twin stick has what seems to be a Sanwa JLF type transparent snap-fit assembly for body and gate (here is only the body upside down without the gate)
notice the final release picture shows a black body and transparent plastic gate but the explanatory video shows a presentation/prototype model which is all transparent clear plastic (even the actuator) as seen in chinese ls56 clones and some “led” jlf clones.
presentation video from september 2019 (joystick is shown at around 06:41 ) :
at first, before viewing the proto video or seeing the final release pics i though it could be somewhat similar to the ascii joysticks(ls56 style), or even revised JLJ-PL2-8V, going as far as thinking the new tanita joystick it could be a microswitch revised version of the analog JLK-GF2-AT (including me) or better , as what was seen in the arcades.
The thing is the final joystick is just a JLF styled flight stick, with a specific pivot housing and hinge lever OMRON switches (unlike the JLF which has pin plunger type).
Since the twinstick is to be sold via Sanwa’s official shop (link) , it seems evident they made the new JLF inspired joystick for Tanita.
The white Tanita proto seemed to sport, from the look of handles, the same Sanwa joysticks as seen in the HORI hx3-50 twinstick (JLJ-PL2-8V ).
The suction cups otoh scream cheap as hell, like those budget wholesale fightsticks. For 510 bucks one would hope they’d have at least put quality rubber feet.
Edit 2:
GUTSHOTS available in this LINK
caption :
handle has a couple of OMRON SS-5D subminiature pin plunger switches rated at 5A and 150gf actuation force, and the OMRON SS-5GL111 long lever subminiature switch at 5A and 40gf actuation force. all are SPDT.
Switches in the joysticks (shown still on the SNAP-FIT JLF style gate) are just OMRON V-152-3A5 hinge lever switches which are rated at the same old 125gf actuation force as the OMRON switch V-152-6A5 used in Sanwa JLW before . V-152-3A5 is the official replacement btw. It’s a bit on the soft side then, for those who aren’t aware of the specs on this type of stick, as the JLK type sanwa handle exerts a stronger force than say a JLW shaft, up to you to replace them with 180gf (OMRON doesn’t make 180gf) or 250gf switches if that’s your thing. This type of switch swap is done often in the Korean joystick world today.
