Here is another watch I bought for practice.
This cool Eterna has a calibre 1115U movement. The dial is in good condition but the varnish has turned yellow. The watch is hardly ticking and I can’t get a reading on the timegrapher.
A first look at the movement. With the exception of some some scratches the movement is fairly clean and in overall pretty good shape. 
The hairspring can very easily be damaged so I usually start by taking the balance out.
The click is mounted on the underside of the barrel bridge.
Movement is coming apart nicely.
Base plate almost ready for the cleaning machine. 
Bottom plate is nice and simple with no complicated date change mechanisms. 
I clean off the old varnish before adding a new layer and finishing of with new luminous compound dots. More on the cleaning process: Dial cleaning 
New mainspring in the barrel. 
The underside of the barrel bridge cleaned up.
Movement coming back together.
Movement is back in the case and ticking.
I only got an amplitude of 253 with my new mainspring, so I serviced the movement again and the result was considerably better than first time around;)
Now this is a smart looking watch! I really like the overall design and especially the red paint on the second hand.
An elegant watch elegantly restored – it really is beautiful. I know some of that beauty is in the simplicity, but unfortunately I’ve found I get frustrated wearing a watch without a date complication. Shame!
What a wonderfull website I have been reading and looking at a lot of your services I really would like to know how do you measure or workout the size of mainspring to use in a watch keep up the good work.
Shaun
Hi Shaun,
http://cousinsuk.com/ lists mainsprings for a lot of movements, and you can order them there, too.
If I can’t find it there, I measure the mainspring with a micrometer for height and thickness, and a ruler for length.
Best regards,
Christian
Hi Mika,
I just love this site and the work that Christian and you are doing.
Also loving your taste in vintage watches, you have chosen some really nice examples for your “practice” pieces.
Question; when you serviced this Eterna movement the second time what did you do differently to achieve such an increase in amplitude?
Nothing special, there was some dirt left in the jewels and the second clean did the job;)
nice work, although i liked the old dial. you have great taste. eterna is the top of my list. if you back and look at the eternas serviced on this site, several have that beautiful straight line on the timographer after service. they are top quality.
I can see why you like the eterna brand. The dial looks nicely sympathetic.
Thanks Mitka
Hi Stephen
I agree Eterna has some really nice dial designs!
Looks great, and a fine result on the timegrapher to boot.
Thanks Troels:)