That is one beautiful coral, however, it is certainly not A. chesterfieldensis. First, the axials are only a bit larger than the radials. In A. chesterfieldensis they are at least twice this size and clearly dome shaped, a bit like in A. sarmentosa. Second, the radials are strongly appressed in your coral, which is untypical and more closely resembles A. valida or A. azurea. Are the openings on the radials round or do they vary from round to nariform?
I picked up a pink-red-rose frag yesterday that may be similar, but is too young to tell. The colour really excited me as reds and deep pinks are rare in Acropora. You have a treasure there!