mayankyadav
·What will be the suggestion if the word "beater" was to be removed from the subject 

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I have a Tag professional (quartz) that I wear as a beater. Hasn't seen much wrist time lately. Looks great on this BR style strap. Was thinking of selling it...
This is really out of left field, but I know someone who wears the Pre-Bond Seamaster as a beater. It is not mechanical, and he said it took a while to find one for cheap, but I think they are still out there for a little over 400 USD. The question is if you could get it waterproof (I would say it is probably possible). And since no thread is complete without a photo, here @dennisthemenace's one (The first nice photo on google images)
I think you might find that that one is mechanical.
Methinks @Lucasssssss meant to say "not manual" because as you correctly point out, it's definitely mechanical.😀
I think he meant to say quartz
Easy. The Hamilton Khaki Field Mechanical. 38mm, hand-wound, slim case ( <10mm) so won't be super prone to smacking into things. It's $475 which isn't a big stretch.
Can't get around a Seiko. I have a SKX013 for the last 6 months, slowly breaking it in.
Before that there was this Seiko. They start looking like that after 14 years on building sites. Never missed a beat. And I still wear it to work when I want a change from the smaller SKX013.
You could even buy it direct from Hodinkee! What a privilege!!
https://shop.hodinkee.com/products/hamilton-khaki-field-mechanical-38mm?variant=5420686901263