I think the 6497 movement in general is a noisy ticker - I own a genuine 177k and a Marina Militare with an asian 6497, they are both the noisiest watches I own, although the asian movement is marginally louder.
My other watches are all solid case backs with anti-magnetic shields - I guess this absorbs the movement noise whereas the case on the 177 is open backed with no magnetic sheilding.
I actually like the ticking, reminds me I have a stunning mechanical watch on my wrist.