Old Bay is a staple in Baltimore!
If you'd like to make your own:

1 tbsp ground bay leaves
2 1/2 tsp celery salt
1 1/2 tsp dry mustard
1 1/2 tsp black pepper
3/4 tsp ground nutmeg
1/2 tsp ground cloves
1/2 tsp ground ginger
1/2 tsp paprika
1/2 tsp red pepper
1/4 tsp ground mace (optional)
1/4 tsp ground cardamom (optional)

Combine all ingredients: store in an airtight container.

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Old Bay Seasoning

1 Tbsp.  Celery Seed
1 Tbsp   Whole Black Peppercorns
6 Bay Leaves
1/2 tsp.  Whole Cardamom
1/2 tsp.  Mustard Seed
4  Whole Cloves
1  tsp.  Sweet Hungarian Paprika
1/4  tsp.  Mace
Dash of Salt
 
>In a spice grinder or small food processor, combine all of the
ingredients.  Grind well and store in a small glass jar.
 