Determine CMYK mix from printed letterhead

[dogwood]

is there a way to determine the CMYK mix of a printed color by looking through a loupe or some other technique.
I have an ivory letterhead with a logo printed on it. I have to recreate the logo and match the color as close as possible.
The client no longer has any logo files for me to pull info from.
Or does anyone have a recommendation on how to match a pre-printed color?
Thank you for your help.

 

[DanRemaley]

Borrow an instrument that measures in Lab. You can then convert that Lab number in Photoshop to CMYK.

 

[Travis Young]

This might sound a bit simple but couldn't you match the colours with a PMS book and then get the cmyk values for the given colour.

 

[Biggs]

The two above comments are good advice, Either use a spectrophotometer or break out the swatch book and start flipping - you may not get a perfect match from he PMS book, but it should give you a close starting point.

 

[taipeiprinter]

I suggest you purchase a CMYK swatch book and find the closest match.