From private collection up for sale rare and sought after Made in Japan Near Mint condition 1979 Boss TW-1 Touch Wah “Long Dash / Silver Screw / Skeleton Switch”.

Serial Number 8400, Made in Japan (Black Label).

Fully working, complete with box and very rare paperwork.

I also throw in a specific still-boxed Boss ACA-220G Power Adapter and a genuine brand-new era-alike Toshiba 9V S-006P battery.

Photos speak for themselves.

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Follows description from Equipboard:

The 1979 Boss TW-1 Touch Wah is a vintage, Japanese-made envelope filter and was the first compact filter effect released by Boss. It is highly prized by collectors for its thick, "throaty" analog tone and its responsive behavior to a player's picking dynamics. 

Key Identification Features (1979 Model)

• "Touch Wah" Name: Units produced in 1978 and 1979 were labeled with the full "Touch Wah" name. Later versions (1980–1987) were shortened to "T Wah".
• Silver Screw: 1979 models typically feature a silver thumb screw to secure the battery compartment, a hallmark of early Boss production before the switch to black plastic screws around 1980.
• Toggle Switch: Along with the CS-1 Compressor, the TW-1 is one of the only Boss compact pedals to feature a metal toggle switch rather than just knobs. 

Controls and Functionality

• Sens (Sensitivity): Adjusts how the effect responds to your playing. Turning it clockwise makes the wah trigger more easily with lighter picking.
• Peak: Controls the depth and tonal "color" of the filter. Clockwise increases the intensity of the "quack," while counterclockwise provides a shallower effect.
• Drive (Up/Down) Switch: Determines the direction of the frequency sweep.
• • Up: The sound shifts from hard to mellow as you pick harder.
• Down: The sound shifts from mellow to hard, creating a "reverse" wah effect. 

Technical Specifications

• Circuitry: Features an analog circuit with a photocoupler (similar to the early CS-1), which contributes to its unique, fluid response and warm musicality.
• Power: Originally designed for the Boss ACA-120 adapter (unregulated 12V DC). Using a modern 9V regulated power supply may result in a dim LED and weaker effect unless it is daisy-chained with other pedals or powered by a vintage-style 12V output. 
  

Disclaimer: minor characteristics due-to-age such as light pots scratching /  hums / hisses / clicks on every 10+ years old electronic equipment for sale may occur. 

During the life span of the items, repair or restoration actions may have been made and different era / craftsmanship components may have been used.

For mentioned items are sold as-is according to the description and provider / e-commerce platform rules.

Please make sure that your shipping address is correct prior to purchasing, incorrect addresses and failing to fulfil eventual customs fees and instructions will result in additional costs.