How did you come to get this pencil? Where and when did you buy it?
It looks quite small, can you take a picture of it aligned to a ruler?
What is the lead size?
The button is interesting; does it pull out like normal MPs for refilling?
Can you disassemble it to show the insides?
What is the word printed on the body? ONAS? Is that a complete word or are any letters scratched off?
I used to have one of these: I was presented with it as a gift, in the Nineties, and it came in a pen-and-pencil set. I remember the rubber grip section, the short body, and the fun little pushbutton in the back. The barrel sported the brand “OSAMA”, which was quite popular in my country at the time, and I still find vintage pieces for sale from that company. I am very unsure the OEM had the same name, it was probably a rebranding of a nameless model by some big manufacturer, probably in China or in Japan.
The pencil has probably disappeared in some cleanup of my childhood room, but I may be able to relocate the pen (very basic mechanism, nothing unusual or fancy) when I get back home.
I had realized it was an old pencil when I saw my student’s pencil, because I have an interest in mechanical pencils. I wanted to learn myself, I suppose it’s hard for me to do what you asked.