Looks like you are only missing the weight. I think it's supposed to be 25 grams. You could probably make one with fishing weights but you can find replacements on eBay. Or so as I did... I just bought off eBay the spring type pressure valve. Yours probably takes the earlier threads (Interestingly, I have the weight but not the lever.)
Make sure you don't use hot water to clean the paint. Too much hot water or too much dishsoap will lift the paint. I recommend a little soap and a dishrag and lukewarm water to clean. Then clean rinse. I use a little bit of mineral oil on a dry rag to protect any rusty parts.