Rega RB250 Tone Arm Instructions dated 1983. As pictured, unsure if complete but looks to be 2 opines of the arm mounting data.

Rega RB250 Tonearm With Origin Live Structural Mod; good original condition. No cartridge or turntable included. This is a great arm that Ive been using to test some turntables Im selling. It is a standard RB250 but with the Origin Live structural mod (counterweight) the current version costs 94! The current pictures on the Origin Live stub and counterweight appear to be chrome whereas this is a very nice mat black which looks great with the arm. The current model also appears to have a bung in the end with Origin Live written on it, this one has an open end. According to Origin Live the performance of this counterweight/structural modification offers a better performance uplift than rewiring: Structural Mod and counterweight 60% Internal rewire 20% External rewire 20% The wiring is all original and the headshell has some marks which Ive tried to highlight in the photographs. None of the issues appear to effect the performance. Ive tested it on a number of turntables and it is a rock solid performer. Sorry no turntable or cartridge included (they are only in the listing to show the item working). UK postage only Ill charge whatever I pay for the postage, collection welcome. Royal Mail Special Delivery (TM) 1:00 pm 1 working day1 working day 1 to 2 kilograms, Max. 61 by 46 by 46 centimeters1 - 2 kg, Max. 61 x 46 x 46 cm Tracking included: Yes Compensation: Up to 500.00 11.15 Please ask any questions before bidding. Update: Ive spoken to Origin Live and they confirmed that the end piece with the logo was just a sticker that gave no performance benefits. They stopped adding them a long time ago as they just fell off.