PS1 & PS2 Wireless Playstation controller - Next Gen by Retro Fighters — Kickstarter
3g Supported Mobile: How To Make PS1 Controller Work On a PS2 Games Console
Working on my PS1 and PS2 controller collection : r/gamecollecting
Sony PlayStation 1 PS1 Analog Controller Rare N50 Works for PS2 Gray Video | eBay
Amazon.com: NEXiLUX Ps2 Controller For Sony Playstation 2 & Ps1 / Psone , Black : Video Games
Let's talk about weird controllers/perephials of the PS1/PS2 era | NeoGAF
Defender Wireless Controller for PS1, PS2 & PS3 – Retro Raven Games
Found a PS1 controller, it's the very first one that doesn't have the analog sticks. Came across this as I was looking for a controller since my PS2 controller's buttons became unresponsive
Official Hori Black Grippy Sindou Pad Controller Playstation 1 & 2 PS1 PS2(B) – Retro Games Japan