Invalid input syntax while restoring db

Hi all!
Trying to restore one of my db on PG-7.4.3 (on Debian-Sarge):

$ psql finanza < finanza.out

I get:
---------
[...]
ERROR: invalid input syntax for type double precision: "-"
CONTEXT: COPY dep_tit, line 1, column ultima_quot: "-"
ERROR: invalid input syntax for type double precision: "-"
CONTEXT: COPY gar_tit, line 1, column ultima_quot: "-"
setval
--------
6
(1 row)
---------

This is an extract of the dump file:

[...]
CREATE TABLE "dep_tit" (
"cod_rif" character(3),
"titolo" character varying(20),
"quantity" integer,
"costo_med_fisc" double precision,
"data_rif" date,
"ultima_quot" double precision,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
"data_ult_q" date
);

[...]

COPY dep_tit (cod_rif, titolo, quantity, costo_med_fisc, data_rif,
ultima_quot, data_ult_q) FROM stdin;
1 Tit. a 100 3.9112 2004-07-23 - -
2 Tit. b 100 4.78 2004-07-23 - -
[...] ^^^^^^ ^^^^^^
\.
----------------

As far as I can understand, the hyphen '-' is not double precision, so
PG is complaining; the question is: is there a way to get around the
problem? How can I avoid dropping those cols and reconstructing them
manually on the restored db?

Thanks for your attention.
Ennio

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