Paintjobs Colors

As Batman says in comments - there are automotive paint stores, depending on where you live, that have a hand held tool that will scan your paint, faded and all, and identify the correct color to match your bike. They use the information from the scanner to mix a color for your bike.

They can make you a can of spray paint or a touch up bottle. in 2015 US dollars they charged me $20 for a can of spray paint.

There are websites that offer custom matching services, myperfectcolor.com is one example (not a recommendation) of a company that will work with you to match your color and then create a spray can with your color.

There are also companies that offer bicycle frame touch up services if you'd rather not do the work yourself.

Just as an FYI Testors model paint is a good option.

I have used it on my bike and was able to match every color on my Trek (Dnister Black - Testors Graphite Black Metallic, Viper Red - Testors Gloss Red, Gloss Black, Flat Black). Fortunately, I have only had to use it on a few pencil tip size nicks. You can find it at most craft stores in the US like Michael's, Hobby Lobby, etc for less than $5.00.

I have found usually a cheap precision paint brush, a steady hand, and a bit of patience can result in some really good results.

vs.

Just eyeballing your bike frame color from ebay it looks like Testors silver without metal flake may match well (Best bet is to hold the bottle next to the bike which is what I did before using it on my frame).