I'm trying to find a translation, but it seems to be so informal that it doesn't appear properly in dictionaries.
The context would be like:
A: Do you know Hans? B: The new guy? A sends a picture B: Achso A: Siehste mal?
closed as unclear what you're asking by Em1, lejonet, fifaltra, Wrzlprmft♦, Vogel612 Jan 24 '14 at 6:45
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.
Siehste mal, which is the colloquial short reduction of Siehst du einmal, can have different meanings depending on the situation context. Here we have
The reaction of A as one wants to translate is not very logical because B has already had a look at it, and this question actually comes too late:
Better appropriate would be an exclamation mark (if that was just a typo?) and the meaning would turn into:
or, without question tag, it could mean a very colloquial short form of:
The word mal (which means einmal) is the time aspect and emphases this moment.
A more credible conversation would be: