Just use the serial numbers in the About window:
http://support.apple.com/kb/HT4132
For example:
MacBook Pro 13-inch
Model | Model Identifier | Model number | Configuration |
MacBook Pro (Retina, 13-inch, Early 2013) | MacBookPro10,2 | MD212xx/A
ME662xx/A |
13.3"/2.5 i5/8GB/128-Flash
13.3"/2.6 i5/8GB/256-Flash |
MacBook Pro (Retina, 13-inch, Late 2012) | MacBookPro10,2 | MD212
MD213 |
13.3"/2.5 i5/8GB/128-Flash
13.3/2.5 i5/8GB/256-Flash |
MacBook Pro (13-inch, Mid 2012) | MacBookPro9,2 | MD101xx/A
MD102xx/A |
13.3"/2.5 i5/2x2GB/500-5400
13.3"/2.9 i7/2x2GB/750-5400 |
MacBook Pro (13-inch, Late 2011) | MacBookPro8,1 | MD314xx/A
MD313xx/A |
13.3"/2.8 i7/2x2GB/750-5400
13.3"/2.4 i5/2x2GB/500-5400 |
MacBook Pro (13-inch, Early 2011) | MacBookPro8,1 | MC724xx/A | 13.3"/2.7 i7/2x2GB/500-5400 |
MC700xx/A | 13.3"/2.3 i5/2x2GB/320-5400 | ||
MacBook Pro (13-inch, Mid 2010) | MacBookPro7,1 | MC375xx/A | 13.3"/2.66/2x2GB/320-5400 |
MC374xx/A | 13.3"/2.4/2x2GB/250-5400 | ||
MacBook Pro (13-inch, Mid 2009) | MacBookPro5,5 | MB991xx/A | 13.3"/2.53/2X2GB/250-5400 |
MB990xx/A | 13.3"/2.53/2X1GB/160-5400 |