“Er, no thank you. I've made my own.”

In Season Sixteen of Doctor Who, Mary Tamm was introduced as the new companion, Romanadvoratrelundar (shortened to Romana). Romana was also a Timelady from Gallifrey, which is the same home planet as The Doctor, making her more of an equal during their adventures together than just a regular companion. At the start of Season Seventeen Romana regenerated and actress Lalla Ward took over the role. 

It was during the season 17 story of Doctor Who, “The Horns of Nimon” where Romana’s own sonic screwdriver prop made its only televised appearance. Whilst repairing a battleship’s engines, Romana declined The Doctor’s offer to borrow his sonic screwdriver, revealing that she had in fact made her own. The Doctor seemed impressed by her efforts and almost "accidentally" took her sonic instead of their own. 

Later on in the story Romana realized whilst attempting to open a locked door that she’d accidentally misplaced her screwdriver during an earlier scene where she confronted the co-pilot of the ship. Romana’s sonic screwdriver was never recovered or replaced in the show but has since appeared in other media.

The physical prop Romana sonic screwdriver was made from metal, with drilled holes, turned grooves and was adorned much like Jon Pertwee’s sonic screwdriver with colored electrical tape. The Doctor described the prop as being:  “Not bad. Bit basic though.” 

In 1981 the original Romana sonic screwdriver filming prop turned up as a prize on the BBC TV show, “The Multi Coloured Swap Shop” to be given away by Sarah Sutton, who played Nyssa alongside the Fourth and Fifth Doctors. 

The Romana sonic screwdriver prop has the distinction of being the oldest known surviving Classic sonic screwdriver.